Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-01-14
Physics
Condensed Matter
Strongly Correlated Electrons
Accepted for publication in J. Phys. Soc. Jpn., 4 pages, 2 figures
Scientific paper
For more than two decades, the nonmagnetic anomaly observed around 17.5 K in URu2Si2, has been investigated intensively. However, any kind of fingerprint for the lattice anomaly has not been observed. Therefore, the order has been called "the hidden order". One simple answer to why the hidden order is still hidden is presented from the space group analysis. The second order phase transition from I4/mmm (No. 139) to P4_2/mnm (No. 136) does not need any kind of lattice distortion in this system, and allows the NQR frequency at Ru-site unchanged. It is compatible with O_{xy}-type anti-ferro quadrupole ordering with Q=(0, 0, 1). The characteristics of the hidden order are discussed based on the local 5f^2 electron picture.
Flouquet Jacques
Harima Hisatomo
Miyake Kazumasa
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